1 The hydrated salt CuSO4 x 5H2O consists of blue crystals and forms blue aqueous solution

Question

1.The hydrated sa CuSO4 x 5H2O consists of blue crystals and forms blue aqueous solution.

The anhydrous sa forms white crystals, but when dissolved in water does also for a blue solution. These observations are consistent with the fact that:

a) only CuSO4 x 5H2O molecules are blue.

b) Cu2+ ions are hydrated to form Cu(H2O)42+ions which absorb blue color.

c) Cu2+ ions are hydrated to form Cu(H2O)42+ions which absorb such wavelengths that we see them blue

d) non-hydrated Cu2+ ions absorb blue

2.It is quite common to add NH3(aq) to samples of Cu2+ to increase absorbance of the solution. Write ONLY the NET IONIC equation for the reaction between CuCl2 (aq) and NH3 (aq) leading to the formation of the complex ion.

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